Melting Chocolate For Transfers

ASo my grocery store doesn't carry melting chocolate ): so I'm stuck with baking chips (later I found out its better to buy chocolate blocks as to baking chips). I don't have time at all to go back and get the blocks so what would be a good and easy way to melt the chips so I can do a chocolate transfer? (similar to FBCT) also I bought white chocolate baking chips also for the coloring and I have gel food coloring, will it ruin the chocolate ?

Thanks in advanced (:

P.s. this is for a cake I plan to draw a ninja turtle and the cake will be frosted and finished